GMC Sierra 2500 HD2022 Owner's Manual page 36

Manual Extend : If equipped, grasp the
mirror housing firmly and pull back in one
motion, arching slightly toward the rear of
the vehicle.
To return the mirror to its original position,
reverse the motion.
Power Extend : If equipped, press the power
extend button to fully extend the mirror.
Press again to retract.
Resetting the Power Extend Mirrors
Reset the power extend mirrors if:
The mirrors are accidentally obstructed
while extending/retracting.
The mirrors are accidentally manually
extended/retracted.
The mirrors vibrate at normal driving
speeds.
Keys, Doors, and Windows
If a popping noise from the mirror is heard,
this sound is normal as the manual detents
are aligning after a manual extend/retract
operation has occurred.
Auxiliary Cargo Mirror Lamps
If equipped, cargo mirror lamps face
rearward to provide more light on the sides
of the vehicle, if needed. See Exterior Cargo
Lamps 0 144.
Advanced Trailering Vision System Side
Cameras
If equipped, the Advanced Trailering Vision
System side cameras are on the bottom of
the outside mirrors. See Surround Vision
(360 Degrees) under Assistance Systems for
Parking or Backing 0 253.
35